ATOS Atossa Therapeutics Inc

Atossa Therapeutics, Inc. (Nasdaq:ATOS), a clinical stage biopharmaceutical company seeking to discover and develop innovative medicines in areas of significant unmet medical need with a current focus on breast cancer and COVID-19, today announced it is set to be added to the Russell 2000 and Russell 3000 Indexes This milestone will take place at the conclusion of the 2021 Russell Indexes’ annual reconstitution, effective after the U.S. market opens on June 28, 2021, according to a preliminary list of additions posted June 4, and June 14, 2021.

“Atossa’s inclusion in both the Russell 2000 and Russell 3000 Indexes present an important opportunity for us to further expand Atossa’s awareness among a broader group of investors, which we expect will also further enhance its liquidity,” said Kyle Guse, Atossa’s CFO and General Counsel.

Membership in the Russell 2000 and Russell 3000 Indexes, which remains in place for one year each, means automatic inclusion in the appropriate growth and value style indexes. FTSE Russell determines membership for its Russell Indexes primarily by objective, market-capitalization rankings, and style attributes.

Russell Indexes are widely used by investment managers and institutional investors for index funds and as benchmarks for active investment strategies. Approximately $10.6 trillion in assets are benchmarked against Russell’s U.S. Indexes. Russell Indexes are part of FTSE Russell, a leading global index provider.

About Atossa Therapeutics

Atossa Therapeutics, Inc. is a clinical-stage biopharmaceutical company seeking to discover and develop innovative medicines in areas of significant unmet medical need with a current focus on breast cancer and COVID-19. For more information, please visit www.atossatherapeutics.com.

Forward-Looking Statements Disclaimer Statement

Forward-looking statements in this press release, which Atossa undertakes no obligation to update, are subject to risks and uncertainties that may cause actual results to differ materially from the anticipated or estimated future results, including, without limitation, statements regarding the satisfaction of closing conditions relating to the offering and the anticipated use of proceeds from the offering, the risks and uncertainties associated with any variation between interim and final clinical results, actions and inactions by the FDA, the outcome or timing of regulatory approvals needed by Atossa including those needed to commence studies of AT-H201, AT-301 and Endoxifen, lower than anticipated rate of patient enrollment, estimated market size of drugs under development, the safety and efficacy of Atossa’s products, performance of clinical research organizations and investigators, obstacles resulting from proprietary rights held by others such as patent rights, whether reduction in Ki-67 or any other result from a neoadjuvant study is an approvable endpoint for oral Endoxifen, and other risks detailed from time to time in Atossa’s filings with the Securities and Exchange Commission, including without limitation its periodic reports on Form 10-K and 10-Q, each as amended and supplemented from time to time.

Company Contact:Atossa Therapeutics, Inc.Kyle Guse, CFO and General CounselOffice: 866 893-4927kyle.guse@atossainc.com

Investor Relations Contact:Core IROffice:(516) 222-2560ir@atossainc.com